so with my car i sent from RE cans to RE cans and RE x pipe first and the added difference was a tiny bit of rasp when the car was cold. it probably added to the note of the car a bit also. Now with addition of Euro headers, the car has plenty of rasp. I also added a Grouppe intake after everything else and the car sounds completely different than when I had RE alone.

If I were in your shoes, I would either go with Grouppe alone or plus a tune and skip on any more exhaust changes